isotherm
/ˈaɪ.səʊˌθɜː(ɹ)m/noun
isotherm is spelled I-S-O-T-H-E-R-M: 8 letters and 3 syllables. It appears about once in every 11 million words in written English, the 98,107th most frequent word form (wordfreq, 2021 data). As a noun, isotherm means “A line on a graph or chart, such as a weather map, along which all the points have the same temperature” (English Wiktionary, September 2026). The plural of isotherm is isotherms.
How many letters and syllables are in isotherm?
| Letters | 8: I-S-O-T-H-E-R-M |
|---|---|
| Syllables | 3 (from its pronunciation) |
| In writing | about once in every 11 million words; the 98,107th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is isotherm?
Isotherm appears about once in every 11 million words in written English, the 98,107th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce isotherm?
- UK /ˈaɪ.səʊˌθɜː(ɹ)m/
Isotherm has 3 syllables (counted from the pronunciation).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-isotherm.wav, Wikimedia Commons (author and licence on each file's page).
Forms of isotherm
- isotherms plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does isotherm mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A line on a graph or chart, such as a weather map, along which all the points have the same temperature.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Isotherm in Spanish, French, German and Portuguese
In the sense line representing equal temperature:
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does isotherm come from?
From the French isotherme (“of equal temperature”, adjective), itself from Ancient Greek ἴσος (ísos, “equal”) + θέρμη (thérmē, “warmth”). By surface analysis, iso- + -therm.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).